Utilize PEX permissions matcher

[muff1nman]

Hi, excellent project. Found it very useful.

I made a couple modifications that were useful to me, and thought you might be interested.

• Added maven dependency framework support. Makes it much easier for incoming folks to build a working jar
• Modified permission checking logic to use PEX Regex matcher directly
  • Makes it so that wildcard expressions are supported
  • Makes the behavior more similar between BPB and PEX
• Simplified group hierarchy calculation
  • Allows use of # character for non-inheritance as done in PEX

[guipenedo]

looks great! have you tested this?

[muff1nman]

I am running this now on my simple setup which consists of a single Admin group with 4 wildcard expressions. Things that have yet to be tested:

• # non-inheritance operator
• Multiple level hierarchies
• Permissions overriding inherited ones

[muff1nman]

While testing, found one interesting edge case. I had a hierarchy of:

group1 --> group2 --> user1
group1: bungeecord.command.list
group2: 
user1:

Which did not work. Turns out that if a user is nested under an empty group, the parent non empty group permissions will not apply as group2 will never be found. Remedied this with the last commit.

Also tested the # operator, tested multi-level hierachies and tested permissions overriding in the hiearchy.

I'm satisfied with it, but wouldn't hurt to have another person take a look.