Refactor as custom package

[cboulay]

This refactors LSL4Unity as a Unity Custom Package that can be installed using the Editor's integrated package manager.

Once the package is installed, it is also possible to install "Samples". Here we provide 3 samples. The first 2 are simple examples of an inlet and an outlet using only LSL.cs. The third is a slightly more complicated yet robust (functionally) example that leverages the Utilities provided in the LSL4Unity namespace.

Here are some issues encountered (and solved):

• Objects in Samples are missing scripts. The solution is to completely replace existing Samples with new ones.
• There are some namespace clashes. StreamInfo was one, but I patched this.
• We have both Resolver and LSLResolver. They are almost identical. These need to be merged.
• Any event streams need to have their default types set to Markers so they can be auto-imported in EEGLAB (to make it easier for users)
• Build testing -- Does it pull in the lsl.dll? (I deleted the BuildHooks, might need to bring those back)
• Check resolver on streams from other computers (see ContinuousResolver Issue #30)

[cboulay]

Everything is working well in the editor. I need to test the builds. If anyone is interested in helping test (especially on Android) then please jump in.