[B+C] Add ability to make items glow. Adds BUKKIT-4767

### The Issue:
There's no way to make an ItemStack glow without adding an Enchantment to it. Some plugins are using reflection and/or NMS access to do it.

### Justification for this PR:
This adds a simple way to make an ItemStack glow.

### PR Breakdown:
##### Bukkit
Added hasGlow() and setGlow(boolean) methods to ItemMeta.
##### CraftBukkit
Implemented hasGlow() and setGlow(boolean) methods in CraftMetaItem and make related changes to the class.

### Testing Results and Materials:
[Test Plugin](https://github.com/Ribesg/TestPlugin/tree/BUKKIT-4767) - [Jenkins build](http://ci.ribesg.fr/job/TestPlugin-4767/)

### Relevant PR(s):
CB-1360 - https://github.com/Bukkit/CraftBukkit/pull/ - Associated CraftBukkit PR

### JIRA Ticket: 
BUKKIT-4767 - https://bukkit.atlassian.net/browse/BUKKIT-4767