Port over attunements infrastructure

I think this should enable the attunement system in Magiclysm, although effect_on_condition and other support code will be needed to port much of the actual Maglclysm attunement content over

.gitignore

@@ -206,3 +206,4 @@ Xcode/
 /tests/pch/tests-pch.hpp.pch
 /tests/catch/catch.hpp.gch
 /tests/catch/catch.hpp.pch
+cbn_notes.txt

src/iexamine.cpp

@@ -389,6 +389,101 @@ void iexamine::gaspump( player &p, const tripoint &examp )
     add_msg( m_info, _( "Out of order." ) );
 }
 
+static bool has_attunement_spell_prereqs( Character &you, const trait_id &attunement )
+{
+    // for each prereq we need to check that the player has 2 level 15 spells
+    for( const trait_id &prereq : attunement->prereqs ) {
+        int spells_known = 0;
+        for( const spell &sp : you.spells_known_of_class( prereq ) ) {
+            if( sp.get_level() >= 15 ) {
+                spells_known++;
+            }
+        }
+        if( spells_known < 2 ) {
+            return false;
+        }
+    }
+    return true;
+}
+
+void iexamine::attunement_altar( Character &you, const tripoint & )
+{
+    std::set<trait_id> attunements;
+    for( const mutation_branch &mut : mutation_branch::get_all() ) {
+        if( mut.flags.count( json_flag_ATTUNEMENT ) ) {
+            attunements.emplace( mut.id );
+        }
+    }
+    // remove the attunements the player does not have prereqs for
+    for( auto iter = attunements.begin(); iter != attunements.end(); ) {
+        bool has_prereq = true;
+        // the normal usage of prereqs only needs one, but attunements put all their prereqs into the same array
+        // each prereqs is required for it as well
+        for( const trait_id &prereq : ( *iter )->prereqs ) {
+            if( !you.has_trait( prereq ) ) {
+                has_prereq = false;
+                break;
+            }
+        }
+        if( has_prereq ) {
+            ++iter;
+        } else {
+            iter = attunements.erase( iter );
+        }
+    }
+    if( attunements.empty() ) {
+        // the player doesn't have at least two base classes
+        you.add_msg_if_player( _( "This altar gives you the creeps." ) );
+        return;
+    }
+    // remove the attunements the player has conflicts for
+    for( auto iter = attunements.begin(); iter != attunements.end(); ) {
+        if( !you.has_opposite_trait( *iter ) && you.mutation_ok( *iter, true, true, true ) ) {
+            ++iter;
+        } else {
+            iter = attunements.erase( iter );
+        }
+    }
+    if( attunements.empty() ) {
+        you.add_msg_if_player( _( "You've attained what you can for now." ) );
+        return;
+    }
+    for( auto iter = attunements.begin(); iter != attunements.end(); ) {
+        if( has_attunement_spell_prereqs( you, *iter ) ) {
+            ++iter;
+        } else {
+            iter = attunements.erase( iter );
+        }
+    }
+    if( attunements.empty() ) {
+        you.add_msg_if_player( _( "You feel that the altar does not deem you worthy, yet." ) );
+        return;
+    }
+    uilist attunement_list;
+    attunement_list.title = _( "Pick an Attunement to show the world your Worth." );
+    for( const trait_id &attunement : attunements ) {
+        // There's no way for you to have this mutation, so a variant is pointless
+        attunement_list.addentry( attunement->name() );
+    }
+    attunement_list.query();
+    if( attunement_list.ret == UILIST_CANCEL ) {
+        you.add_msg_if_player( _( "Maybe later." ) );
+        return;
+    }
+    auto attunement_iter = attunements.begin();
+    std::advance( attunement_iter, attunement_list.ret );
+    const trait_id &attunement = *attunement_iter;
+    // There's no way for you to have this mutation, so a variant is pointless
+    if( query_yn( string_format( _( "Are you sure you want to pick %s?  This selection is permanent." ),
+                                 attunement->name() ) ) ) {
+        you.toggle_trait( attunement );
+        // There's no way for you to have this mutation, so a variant is pointless
+        you.add_msg_if_player( m_info, attunement->desc() );
+    } else {
+        you.add_msg_if_player( _( "Maybe later." ) );
+    }
+}
+
 void iexamine::translocator( player &, const tripoint &examp )
 {
     // TODO: fix point types

src/iexamine.h

@@ -103,6 +103,8 @@ void sign( player &p, const tripoint &examp );
 void pay_gas( player &p, const tripoint &examp );
 void ledge( player &p, const tripoint &examp );
 void autodoc( player &p, const tripoint &examp );
+bool has_attunement_spell_prereqs( Character &you, const trait_id &attunement )
+void attunement_altar( Character &you, const tripoint &examp );
 void translocator( player &p, const tripoint &examp );
 void on_smoke_out( const tripoint &examp,
                    const time_point &start_time ); //activates end of smoking effects

src/mutation_data.cpp

@@ -620,7 +620,9 @@ void mutation_branch::check_consistency()
 
 nc_color mutation_branch::get_display_color() const
 {
-    if( threshold || profession ) {
+    if( flags.count( STATIC( json_character_flag( "ATTUNEMENT" ) ) ) ) {
+        return c_green;
+    } else if( threshold || profession ) {
         return c_white;
     } else if( debug ) {
         return c_light_cyan;