Updated to work with nim 0.20

- Attempt to fix deprecated this:self pragma by injecting self to methods and properties (needs more testing)
- Changed import headers to use / (slash) instead of . (period)
- Fixed object branch in godotapigen.nim
- Fixed deprecated nimNode.ident with nimNode.strVal

Fix toGodotName function

Consider procCall calls as special cases, otherwise it gives problems in _init function

Fix infinite recursive call in Godot 3.2

godot/godotinternal.nim

@@ -1,8 +1,8 @@
 # Copyright 2018 Xored Software, Inc.
 
-import internal.godotinternaltypes, internal.godotarrays,
-       internal.godotnodepaths, internal.godotpoolarrays, internal.godotstrings,
-       internal.godotvariants, internal.godotdictionaries
+import internal/godotinternaltypes, internal/godotarrays,
+       internal/godotnodepaths, internal/godotpoolarrays, internal/godotstrings,
+       internal/godotvariants, internal/godotdictionaries
 
 import gdnativeapi
 export godotinternaltypes, godotarrays, godotnodepaths, godotpoolarrays,