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.

lib/CPlayerState.cpp

@@ -0,0 +1,69 @@
+/*
+ * CPlayerState.cpp, part of VCMI engine
+ *
+ * Authors: listed in file AUTHORS in main folder
+ *
+ * License: GNU General Public License v2.0 or later
+ * Full text of license available in license.txt file, in main folder
+ *
+ */
+#include "StdInc.h"
+
+#include "CPlayerState.h"
+#include "CGameStateFwd.h"
+
+PlayerState::PlayerState()
+ : color(-1), human(false), enteredWinningCheatCode(false),
+   enteredLosingCheatCode(false), status(EPlayerStatus::INGAME)
+{
+	setNodeType(PLAYER);
+}
+
+PlayerState::PlayerState(PlayerState && other):
+	CBonusSystemNode(std::move(other)),
+	color(other.color),
+	human(other.human),
+	team(other.team),
+	resources(other.resources),
+	enteredWinningCheatCode(other.enteredWinningCheatCode),
+	enteredLosingCheatCode(other.enteredLosingCheatCode),
+	status(other.status),
+	daysWithoutCastle(other.daysWithoutCastle)
+{
+	std::swap(visitedObjects, other.visitedObjects);
+	std::swap(heroes, other.heroes);
+	std::swap(towns, other.towns);
+	std::swap(availableHeroes, other.availableHeroes);
+	std::swap(dwellings, other.dwellings);
+	std::swap(quests, other.quests);
+}
+
+std::string PlayerState::nodeName() const
+{
+	return "Player " + color.getStrCap(false);
+}
+
+PlayerColor PlayerState::getColor() const
+{
+	return color;
+}
+
+TeamID PlayerState::getTeam() const
+{
+	return team;
+}
+
+bool PlayerState::isHuman() const
+{
+	return human;
+}
+
+const IBonusBearer * PlayerState::accessBonuses() const
+{
+	return this;
+}
+
+int PlayerState::getResourceAmount(int type) const
+{
+	return vstd::atOrDefault(resources, static_cast<size_t>(type), 0);
+}