use GLSL shaders

modules/core_scripts/ext/color.lua

@@ -1 +0,0 @@
-Color = {}

modules/core_scripts/ext/point.lua

@@ -1 +0,0 @@
-Point = {}

modules/core_scripts/ext/rect.lua

@@ -1 +0,0 @@
-Rect = {}

modules/core_scripts/ext/size.lua

@@ -1 +0,0 @@
-Size = {}

modules/core_scripts/ext/string.lua

@@ -13,12 +13,12 @@ function string:starts(start)
   return self:sub(1, #start) == start
 end
 
-function string.trim(str)
-  return str:match'^%s*(.*%S)' or ''
+function string:trim()
+  return self:match('^%s*(.*%S)') or ''
 end
 
 function toboolean(str)
-  str = string.trim(str)
+  str = str:trim()
   if str == '1' or str == 'true' then
     return true
   end

modules/core_scripts/ext/table.lua

@@ -1,7 +1,7 @@
 function table.dump(t, depth)
   if not depth then depth = 0 end
   for k,v in pairs(t) do
-    str = string.rep(' ', depth * 2) .. k .. ': '
+    str = (' '):rep(depth * 2) .. k .. ': '
     if type(v) ~= "table" then
       print(str .. tostring(v))
     else