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/internal/godotarrays.nim

@@ -1,6 +1,6 @@
 # Copyright (c) 2018 Xored Software, Inc.
 
-import godotinternaltypes, gdnativeapi, core.godotcoretypes
+import godotinternaltypes, gdnativeapi, core/godotcoretypes
 
 proc len*(self: GodotArray): cint {.inline.} =
   getGDNativeAPI().arraySize(self)

godot/internal/godotpoolarrays.nim

@@ -1,7 +1,7 @@
 # Copyright (c) 2018 Xored Software, Inc.
 
 import godotinternaltypes, gdnativeapi
-import core.godotcoretypes
+import core/godotcoretypes
 
 template genPoolArrayAPI(ArrayT, initIdent, DataT,
                          newProc, newCopyProc, newWithArrayProc, appendProc,

godot/internal/godotvariants.nim

@@ -1,6 +1,6 @@
 # Copyright 2018 Xored Software, Inc.
 
-import core.godotcoretypes, godotinternaltypes, gdnativeapi
+import core/godotcoretypes, godotinternaltypes, gdnativeapi
 
 proc getType*(p: GodotVariant): VariantType {.inline.} =
   getGDNativeAPI().variantGetType(p)