Better room editor for GMS1

[Miepee]

trafficstars

Which component should be improved?

UI/UX

Describe your feature suggestion in more detail

Marking this for GMS1 specifically, as GMS2 already has its own room editorish with CST's recent pull request. Stuff that's really helpful to have for gms1:

• Layers
  • ideally fully custom by end user. That way they can have different layers for collision/enemies/special objects or for layer "main stuff" on depth -100, "deco stuff 1" on depth -101, "deco stuff 2" on depth -101. The big question would be on how to save these extra data, since obviously layers don't exist in the datafile. But a first concept with "just" making layers for every tile depth + game objects would probably be good enough for most cases.
• Easy way to draw and erase tiles. Selecting tiles (in masses) should be second.
• Should have a UI grid defined per layer (or just easily changeable) That way you can e.g. place "collision tiles" always in a 16x16 grid, but foreground decoration stuff in a grid of 4x4