Removed dependency BattlePluginsAPI

Also changed the testSourceDirectory
Fixed some IDE errors in src/tests packages
Made addTimedSpawn() public again
Added testFailureIgnore=true & added ant-copy-file

testFailureIgnore=true

ensures that BattleArena will build even when unit tests produce errors.

The ant-copy-file will automatically copy target/BattleArena.jar to my
server/plugins/ folder.

This /server/ folder is inside my /projects/ folder.

It is a shared server between all my projects.

It allows me to begin testing immediately after maven builds BattleArena.
(or one of my other projects).
Removed field BattlePluginsAPI

This field was used to communicate with
www.battleplugins.com
Removed references to BattlePluginsAPI
Merge branch 'master' of https://github.com/BattlePluginsDev/BattleArena
Added dependency for WorldEdit

BattleArena compiles with WorldEdit v5.5.8

but it does not compile with WorldEdit v6.0.0