Move core modules into main repository; drop submodules

As discussed numerous times, get rid of the submodule approach for core modules and just included the sources directly in the main repository.

I have no idea how this will play with existing working copies. It might be necessary to [manually clear out the existing submodules](http://stackoverflow.com/questions/1260748) first.

Author: starkos

.gitmodules

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+Premake extension to support the [CodeLite](http://www.codelite.org/) IDE
+
+### Features ###
+
+* Support for C/C++ language projects
+
+### Usage ###
+
+Simply generate your project using the `codelite` action:
+```bash
+premake5 codelite
+```
+and open the generated project file in CodeLite.

modules/codelite

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+return {
+	"_preload.lua",
+	"codelite.lua",
+	"codelite_workspace.lua",
+	"codelite_project.lua",
+}

modules/codelite/README.md

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+--
+-- Name:        codelite/_preload.lua
+-- Purpose:     Define the CodeLite action.
+-- Author:      Ryan Pusztai
+-- Modified by: Andrea Zanellato
+--              Andrew Gough
+--              Manu Evans
+-- Created:     2013/05/06
+-- Copyright:   (c) 2008-2015 Jason Perkins and the Premake project
+--
+
+	local p = premake
+
+	newaction
+	{
+		-- Metadata for the command line and help system
+
+		trigger         = "codelite",
+		shortname       = "CodeLite",
+		description     = "Generate CodeLite project files",
+
+		-- The capabilities of this action
+
+		valid_kinds     = { "ConsoleApp", "WindowedApp", "Makefile", "SharedLib", "StaticLib", "Utility" },
+		valid_languages = { "C", "C++" },
+		valid_tools     = {
+		    cc = { "gcc", "clang", "msc" }
+		},
+
+		-- Workspace and project generation logic
+
+		onWorkspace = function(wks)
+			p.modules.codelite.generateWorkspace(wks)
+		end,
+		onProject = function(prj)
+			p.modules.codelite.generateProject(prj)
+		end,
+
+		onCleanWorkspace = function(wks)
+			p.modules.codelite.cleanWorkspace(wks)
+		end,
+		onCleanProject = function(prj)
+			p.modules.codelite.cleanProject(prj)
+		end,
+		onCleanTarget = function(prj)
+			p.modules.codelite.cleanTarget(prj)
+		end,
+	}
+
+
+--
+-- Decide when the full module should be loaded.
+--
+
+	return function(cfg)
+		return (_ACTION == "codelite")
+	end

modules/codelite/_manifest.lua

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+--
+-- Name:        codelite/codelite.lua
+-- Purpose:     Define the CodeLite action(s).
+-- Author:      Ryan Pusztai
+-- Modified by: Andrea Zanellato
+--              Andrew Gough
+--              Manu Evans
+-- Created:     2013/05/06
+-- Copyright:   (c) 2008-2015 Jason Perkins and the Premake project
+--
+
+	local p = premake
+
+	p.modules.codelite = {}
+	p.modules.codelite._VERSION = p._VERSION
+
+	local codelite = p.modules.codelite
+	local project = p.project
+
+
+	function codelite.cfgname(cfg)
+		local cfgname = cfg.buildcfg
+		if codelite.workspace.multiplePlatforms then
+			cfgname = string.format("%s|%s", cfg.platform, cfg.buildcfg)
+		end
+		return cfgname
+	end
+
+	function codelite.esc(value)
+		local result = value:gsub('"', '\\"')
+		result = result:gsub('<', '&lt;')
+		result = result:gsub('>', '&gt;')
+		return result
+	end
+
+	function codelite.generateWorkspace(wks)
+		p.eol("\r\n")
+		p.indent("  ")
+		p.escaper(codelite.esc)
+
+		p.generate(wks, ".workspace", codelite.workspace.generate)
+	end
+
+	function codelite.generateProject(prj)
+		p.eol("\r\n")
+		p.indent("  ")
+		p.escaper(codelite.esc)
+
+		if project.iscpp(prj) then
+			p.generate(prj, ".project", codelite.project.generate)
+		end
+	end
+
+	function codelite.cleanWorkspace(wks)
+		p.clean.file(wks, wks.name .. ".workspace")
+		p.clean.file(wks, wks.name .. "_wsp.mk")
+		p.clean.file(wks, wks.name .. ".tags")
+		p.clean.file(wks, ".clang")
+	end
+
+	function codelite.cleanProject(prj)
+		p.clean.file(prj, prj.name .. ".project")
+		p.clean.file(prj, prj.name .. ".mk")
+		p.clean.file(prj, prj.name .. ".list")
+		p.clean.file(prj, prj.name .. ".out")
+	end
+
+	function codelite.cleanTarget(prj)
+		-- TODO..
+	end
+
+	include("codelite_workspace.lua")
+	include("codelite_project.lua")
+
+	return codelite