Various enhancements, fixes, and tweaks focused on improving the inspector (#34)

* Added Dynamic Gravity Toggle

Added an editor toggle for dynamic gravity so users don't need to uncomment code in character.gd.

* Refactor controls export variables

Changed controls export variables to be a single dictionary so they can be edited completely in the editor without having to open the script. I also refactored the controller support section to allow similar functionality for controller specific controls and removed the need to uncomment/comment out lines of code to turn on/off controller support.

* Add more editor descriptions and implement camera axis inversion options

Added/tweaked export variable descriptions so everything has one. Also slightly refactored the camera input inversion code and added the ability to invert the camera x axis.

* Added direction based landing animations

Added some logic to determine which landing animation to play so it's not random anymore. Also added a land_center animation for the case of neutral landings. This can be expanded if desired, but it's pretty convincing as is and is ulitmately a small detail.

* Correct various grammar and spelling errors

A final pass to clean up any grammatical or spelling errors in the comments

* Re-organized Character.gd

Hope I'm not overstepping here, but I re-organized Character.gd to make it a bit easier to read and work with. Added editor bookmarks and collapsible code regions. It's hard to parse in the diff so I recommend you look at it in Godot proper.

* Commented out debug print statement

I assume this was left uncommented by mistake. I was wondering what was printing that to my console.

* Fixed Landing Animation Logic

I guess I was up too late on my first attempt because it straight up didn't work. This new version works as far as my testing can tell.

* Removed some unused variables

addons/fpc/EditorModule.gd

@@ -31,7 +31,7 @@ extends Node
 
 func _ready():
 	if !Engine.is_editor_hint():
-		print("not editor")
+		#print("not editor")
 		HEAD.rotation.y = deg_to_rad(head_y_rotation)
 		HEAD.rotation.x = deg_to_rad(head_x_rotation)