Fixes #35

Closes #60

Needs testing, I did none :)

Closes #34

Closes #49

* Add support for plugins that want midi input and aren't synths

* Check for WANT_MIDI_INPUT instead of IS_SYNTH for process()

* Set VST parameter hints where useful

* Set proper vst parameter display depending on hints

* Add support for kVstParameterCanRamp

* Use good flag for kVstParameterCanRamp

* Don't force on/off text + minor changes

* Prefer bool flag and zero-init parameter properties

* Misc changes

* Consider params that are both int and bool in ParamDisplay

* Round int parameters properly in ParamDisplay

* Refactor if/else in ParamDisplay

Proper namespace for isBase64Char

Fix VST build with custom DISTRHO namespace

Fix Circle<T>::getY()

Fix some fall through compiler warnings

* Explicitly state supported options and use the correct sampleRate

* Accept lv2:sampleRate too just in case

* Typo

* Style fix

* Remove lv2:sampleRate

* Remove unnecessary newlines

* Missing semicolon

lv2: Fix bug with multiple output param ports generating invalid ttl