Script manipulation and bugfixes

Additions:

• You can now create, remove, rename, and drag around scripts and script groups.
  If you feel like helping out with other resource types, be my guest - it's non excessively hard but monotonous work (except for extensions & included files, those require different handling)
• There's now an option to auto-complete by partial match (GMS2 style) instead of start-match (GMS1 style).
• Added "show in directory" to the main menu.

Improvements:

• Trying to open a file from a project (via Open-with, etc.) will now open the according project and then open a file tab in it.
• Trailing whitespace is now ignored when detecting changes (fixes GMS1 projects reporting changes when it's just IDE adding/removing trailing lines randomly)

Changes:

• If you have a custom theme, you'll need to change up treeview highlight selectors from
  .treeview .heade:hover
  to
  .treeview .header:not(:active):hover
  (same for .item and > span)
  This is to prevent item background from being visible while dragging them around.

Fixes:

• The recently introduced #macro Config:name syntax now works correctly with GMEdit auto-completion.
• Fixed auto-completion data occasionally breaking after soft reload (Ctrl+R).
• Fixed "open declaration" not working for #import-ed identifiers.
• Fixed variable_global_ functions not being highlighted/shown in auto-completion.
• Fixed #args causing #imports on subsequent line to not expand.
• Fixed #args not collapsing optional arguments on load since introduction of types.
• Fixed file conflict message using odd precision for sizes.
• Fixed GMX loader not working on Mac/Linux because of backslashes in extensions.
• Fixed type magic not working for a line after #args magic.
• Fixed type magic not working if there are no #imports.
• Fixed type magic dot auto-completion not popping up if there's a longer variable than one being completed (#28).
• Fixed it not being possible to open help for GMS1 functions with "color" in the name (source data is incomplete)