Dynamically display pathing maps + command to do so

[Son-Guhun]

New arg for the function that applies a pathing map: showBlocked

if showBlocked is true:

• Displays images for any cells that were blocked by the operation (or were already blocked).
• Images for blocks that were unblocked by the operation are always hidden (if they were visible).

Cases for validation:

• apply(true, true) called for a cell that was already blocked -> image shown
• apply(true, false) called for a cell that was blocked and had image shown -> image still shown
• apply(false, -) called for blocked cell with image shown that becomes unblocked -> image hidden.
• apply(false, -) called for a blocked cell with image hidden -> image still hidden
• apply(false, -) called for a blocked cell, but does not change state -> image visibility kept
• apply(false, -) called for a blocked cell from the only source for that cell which had visibility enabled -> image remains visible, when it should have been hidden.

Commands:

• path show/hide -> toggle path display for the specified unit
• path on/off -> toggle path map for the specified unit
• path reset -> reset value for both visibility and state to default for the specified unit
• path reset visibility -> reset visibility only
• path reset state -> reset on/off state only
• path default show/hide -> toggle whether pathing maps should be shown for the player's units by default
• path default on/off -> toggle whether pathing maps should on or off for the player's units by default.
• path default all (arg) -> toggle default value for all players (Titan Only)