Add getSkillIncrease() and setSkillIncrease() script functions to get and set the attribute bonuses received at the next level up as a result of skill increases.
Previously, getSkill() and setSkill() attempted to return and set the attribute bonuses, respectively. However, they mistakenly used a skill ID as a parameter for the attribute bonuses, when in fact npcStats.mSkillIncrease is an integer array of size 8 where the key stands for an attribute's ID. As a result, setSkill() had the unexpected side effect of messing up a player's major and minor skills because of the invalid values it was setting for npcStats.mSkillIncreases.
Previously, charGenStage.end was doing double duty as both the variable indicating the number of CharGen stages and – when set to 0 – the variable indicating that CharGen was over. The latter role is now filled by a new boolean.
This commit changes the style of tes3mp serverside scripting mods. Short list of changes:
* Break compatibility with old server mods
* OOP style lua API
* Basic dependency checker, allowing the installation of multiple server mods without changing configs
* Remove support for C++ plugins
* Change outdated LuaBridge to [sol2](https://github.com/ThePhD/sol2);
* Support GCC, Clang and MSVC compilers
* New environment variables: "TES3MP_SERVER_DIR" and "TES3MP_SERVER_USERDIR";
* New entity "Command controller" for registering new chat commands;
* New Event system
* Simplified Timer API
* All Lua mods now run in their own environments
* Add global namespace - Data that can be used for communicating between mods
* Player and Actor inherit base class NetActor
Add new initialization script functions to allow clearing all player changes vectors in a manner consistent with Actor and World functions
Add toOthers boolean to all methods that send packets with player changes vectors
This avoids confusion when either of those is used to store and send a single item, and no longer requires coming up with confusing variable names like realSpellbook or realInventory for actual full spellbooks and inventories.
