Entities redesign and a few ERM features

* Made most Handlers derived from CHandlerBase and moved service API there.
* Declared existing Entity APIs.
* Added basic script context caching
* Started Lua script module
* Started Lua spell effect API
* Started script state persistence
* Started battle info callback binding
* CommitPackage removed
* Extracted spells::Caster to own header; Expanded Spell API.
* implemented !!MC:S, !!FU:E, !!FU:P, !!MA, !!VR:H, !!VR:C
* !!BU:C, !!BU:E, !!BU:G, !!BU:M implemented
* Allow use of "MC:S@varName@" to declare normal variable (technically v-variable with string key)
* Re-enabled VERM macros.
* !?GM0 added
* !?TM implemented
* Added !!MF:N
* Started !?OB, !!BM, !!HE, !!OW, !!UN
* Added basic support of w-variables
* Added support for ERM indirect variables
* Made !?FU regular trigger
* !!re (ERA loop receiver) implemented
* Fixed ERM receivers with zero args.

scripts/lib/erm/ReceiverBase.lua

@@ -0,0 +1,18 @@
+local ReceiverBase = {}
+
+function ReceiverBase:new(o)
+	o = o or {}
+	setmetatable(o, self)
+	self.__index = self
+	return o
+end
+
+function ReceiverBase:p1Dispatcher(code)
+	self[code] = function(self, x, ...)
+		local N = select(1, ...)
+		return nil, self[code..tostring(N)](self, x, select(2, ...))
+	end
+end
+
+return ReceiverBase
+