Add presets

[sverhoeven]

Refs #61

TODO

• store preset as JSON files in apps/class-solid/public/presets
• Start button shows avalable presets, and on click its loaded
• On experiment knows if it was made from a preset, shown as star icon
  • preset persist on save
  • preset persist on dowload configuration
  • preset persist on dowload configuration & output
• http://localhost:3000/?preset=/presets/death-valley.json loads the preset.
• load from url with preset and partial configs
• experiment from preset should have reference.config be partial towards preset. Aka when preset has theta_0: 500, then in reference form 500 should be placeholder.
• permutation from experiment from preset should have its config partial towards reference config and preset. For example if preset has theta_0:500 and reference theta_0: 333 then placeholder in permutation form should be 333.
• pruneConfig
  • (permuation, reference)
  • (permuation, reference, preset)
• mergeConfigs(permuation, mergeConfigs(reference, preset))
• use presets/defaults.json for defaults instead of defaults in packages/class/src/config.ts,
• make app/presets/defaults.json symlink from package/src/defaults.json , make sure its included in npm publish config.json not on npm.js #76
• makes preset required, with default to presets/defaults.json
• make sure in diff, download and form partial configs are used, everywhere else use full config.