Open-event-droidgen: Improve butterknife implementation

[gogeta95]

App uses butterknife in just some parts of the app, while it should be used everywhere to improve performance.
Also update butterknife to latest version.

[the-dagger]

@gogeta95 You can go ahead and work on this if you like :+1:

[gogeta95]

@mananwason, are you still working on this?

[betterclever]

@gogeta95 Can I work on this issue ?

[gogeta95]

@betterclever sure, go ahead. :+1:

[gogeta95]

@betterclever whats the status of this issue?

[betterclever]

@gogeta95 I experienced some problems while updating Butterknife to latest version. I am trying to resolve them.

[gogeta95]

okay.. let me know if you need any help.