specify map folders in mod.yaml

closes #3544
CamelCase for FileSystem folder
StyleCop cleanup
translate ^ and ~ as FileSystem.Mount does
load maps only from MapFolders defined separately in mod.yaml
Use proper tile ID for RA anthills
Merge pull request #4019 from cjshmyr/tilesetfix

Fixes #3865
Rename Capture related traits to ExternalCapture
Rename LegacyCapture related traits to Capture
Move Zombie up in the infantry tab build palette order
Merge pull request #3917 from Mailaender/map-folders

Removed hard-coded map folders
Merge pull request #4022 from cjshmyr/infantrytab

Move Zombie up in the RA infantry tab build palette order
Merge pull request #4021 from cjshmyr/capturing

 Renamed Capture traits to ExternalCapture & LegacyCapture traits to Capture
Tidy IInputHandler.
Split text input into its own event.
Tidy renderer dependencies.
Add SDL2 renderer based on SDL2# wrapper. Closes #3315.

SDL2# binary was built from commit 70af91f84493a924a3c1da46ae6209bb5f7222e3.
Add Haos Ridges C&C map.

Includes minor tweaks to the description and Options.
Fix player spawns in Deterring Democracy.
Double clicking a map in the chooser now selects it.