Fix for latest Nim

Closes #23.

godot/internal/godotstrings.nim

@@ -29,14 +29,13 @@ proc `$`*(self: GodotString): string =
   result = newString(length)
   copyMem(addr result[0], getGDNativeAPI().charStringGetData(charStr), length)
   getGDNativeAPI().charStringDestroy(charStr)
-  assert(result[length] == '\0')
 
 proc toGodotString*(s: string): GodotString {.inline.} =
   ## Converts the Nim string into ``GodotString``
   if s.isNil:
     initGodotString(result)
   else:
-    initGodotString(result, unsafeAddr s[0], cint(s.len + 1))
+    initGodotString(result, cstring(s), cint(s.len + 1))
 
 proc toGodotString*(s: cstring): GodotString {.inline.} =
   ## Converts the cstring into ``GodotString``

godot/nim/godotnim.nim

@@ -297,8 +297,8 @@ macro toGodotName(T: typedesc): string =
     godotName = "float"
   elif T is SomeUnsignedInt or T is SomeSignedInt:
     godotName = "int"
-  if godotName.isNil:
-    let nameStr: string = (($T.getType()[1][1].symbol).split(':')[0])
+  if godotName.isNil or godotName.len == 0:
+    let nameStr = (($T.getType()[1][1].symbol).split(':')[0])
     godotName = case nameStr:
     of "File", "Directory", "Thread", "Mutex", "Semaphore":
       "_" & nameStr