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/godot.nim

@@ -1,14 +1,14 @@
 # Copyright 2018 Xored Software, Inc.
 
-import core.godotbase, godotinternal
-import core.godotcoretypes
-import core.vector2, core.rect2, core.vector3, core.transform2d, core.planes,
-       core.quats
-import core.aabb, core.basis, core.transforms, core.colors, core.nodepaths,
-       core.rids
-import core.dictionaries, core.arrays, core.poolarrays, core.variants
+import core/godotbase, godotinternal
+import core/godotcoretypes
+import core/vector2, core/rect2, core/vector3, core/transform2d, core/planes,
+       core/quats
+import core/aabb, core/basis, core/transforms, core/colors, core/nodepaths,
+       core/rids
+import core/dictionaries, core/arrays, core/poolarrays, core/variants
 
-import nim.godotmacros, nim.godotnim
+import nim/godotmacros, nim/godotnim
 
 export godotbase, godotcoretypes, vector2, rect2, vector3, transform2d, planes,
        quats, aabb, basis, transforms, colors, nodepaths, rids, dictionaries,