Contributor: ShinichiYao

Added config reload and test.

Reported by: kotsoskorg
Fixed by: Avanael92

Added database cleanup file.

Organizing all imports.

Moved to Maven instead of Gradle.
Using proper project structure and package structure.

Can be found (already updated) here:
https://bitbucket.org/l2jserver/l2j-server-cli/

Reported by: ShinichiYao
Thanks to: ruk33

JDK11, we recommend OpenJDK for both Linux and Windows.
Updating Bitbutcket Pipeline OpenJDK11.
Updating Gradle Wrapper to 5.1.1.

- Fixed all consume effects;
	- Reported by: FinalDestination
- Added new effect MaxMp
- Updated skills with MaxHp and MaxCp effects.

- More retail like skills with consume and tick effects;
- Organized effects inside proper folders, custom effects will be fixed
later;
- Removed useless effect type.
	
NB: Required Core part.

Reported by: ShinichiYao

	- Renamed "element" to "attributeType" and "elementPower" to
"attributePower";
	- Fixed some skills with wrong attribute parameters.
	
DP part of:
https://bitbucket.org/l2jserver/l2j_server/commits/fba965be41a44ea37780a0e7ead6893c65b5acaf

DP part of
https://bitbucket.org/l2jserver/l2j_server/commits/7a600e5d22fa4a1efab7ee487c2f76003d2ba977

Required core part
https://bitbucket.org/l2jserver/l2j_server/commits/a99a6f78dfd7cac631e5aeb4d4a9a2f1b3936d7b

Reported by: FinalDestination