Move definitions into new file ttblue.h

[Grimler91]

Remove structs with files as they are mostly identical between V1 and V2 devices. Use similar format as the ttwatch project do, as a first step for a potential future merge of the projects.

Some interesting information:

• There seem to be 11 bluetooth commands in total used by the android app
• There are at least 3 types of notifications: phone call, text message and voice mail/misc.(?)

[Grimler91]

Note to self: PR should be updated if #13 is merged before this one