Updated extensions to modern style, added a heap of tests

modules/codelite

@@ -1 +1 @@
-Subproject commit d6bd3883aa32769eda24f98f5ad6631e7679a67d
+Subproject commit a72d326601add809cd5c5c2af7851cdc311767cc

modules/d

@@ -1 +1 @@
-Subproject commit d037ed35a215d32222e3dfac443534330df49f52
+Subproject commit d09d7bef237460ce173575bbfe47f49f7b3f1da5

modules/monodevelop

@@ -1 +1 @@
-Subproject commit 1606eac28158c41c0dd828b8c278cd31c82899b2
+Subproject commit b883ba45c05f7065456029591e742096fbf53526

src/_premake_main.lua

@@ -108,10 +108,9 @@
 			preloader = os.locate("modules/" .. preloader) or os.locate(preloader)
 			if preloader then
 				m._preloaded[name] = include(preloader)
-				-- leave off until existing core modules can catch up
-				-- if not m._preloaded[name] then
-				-- 	p.warn("module '%s' should return function from _preload.lua", name)
-				-- end
+				if not m._preloaded[name] then
+					p.warn("module '%s' should return function from _preload.lua", name)
+				end
 			else
 				require(name)
 			end