[InProgress][v0.1.13] Cache improvements, Post actions & More

Going to kick this version off with some cache improvements to smooth out the experience. Then I will move on to other features on the roadmap.

Changes so far (may be regularly updated):

• Cache user subscriptions. User subscriptions will continue to refresh on app load, however a cache will always be shown.
• Fix a bug where "set as home" will not work if the user is already on the home "tab". (Fun fact, the app treats each community on the left pane as a "tab". Each tab actually has it's own history).
• Change the behavior of the home button. If the home button is tapped when you are at the top of page 1 of a community page and you are not on your home page then you will be taken to your home page.
• Added the ability to create, edit or delete posts.

Update

Going to roll this out to beta. I will roll out to release tomorrow morning. Good night!