Reported by: Koroniz

Moving all files to main folder.
Using Gradle to define, manage dependecies and build the project.
Upgraded Gradle wrapper.

	* Once More In the Arms of the Mother Tree (46)
	* Into the Dark Elven Forest (47)
	* To the Immortal Plateau (48)
	* The Road Home (49)

Patch by: janiko
Reviewed by: jurchiks, xban1x, ivantotov, Zoey76

	* Patch by: janiko
	* Reviewed by: jurchiks, Zoey76
	* Tested by: Zoey76