Foxdotpatterns

- Improved `PlayerKey.map` method e.g. `p1.pitch` to only return one value instead of a Pattern
- Improved `Clock.clear` to make sure Players don't reset and continue playing, which sometimes happened
- Use `float` instead of `Fraction` for timing to reduce computation time in the main clock loop. So far this hasn't had any impact on timing but please get in contact if it does. It has improved performance on low spec machines such as a Raspberry Pi.
- Improve bracket finding in the main interface so it only checks visible portion of the screen so it no longer lags if there is a large amount of text in the editor.
- Added the `VRender` extension, thanks to [mathigatti](https://github.com/mathigatti), that allows users to add synthesised vocals. Requires Python modules MIDIUtil and urllib and musescore (Linux/Mac only). See the [README](https://github.com/Qirky/FoxDot/blob/master/FoxDot/lib/Extensions/VRender/README.md) for more information.

- Continued work on improving efficiency across the board. Now works fine on Raspberry Pi machines (be careful when using lots of a effects though!).
- Fixed the `sus` and `blur` issues when using a different tempo.
- Improved timing on `Player` method calls that send extra OSC messages, such as `stutter` and `jump`.
- Renamed `Pattern` method `pipe` to `concat`. Also improved efficiency of this method as well as making `Pattern.append()` much more efficient (useful to adding items to a `Pattern` from a loop.

- Changed the behaviour for composing events sent to SuperCollider. When several `PGroup`s with different sizes are used, events are now the size of the largest `PGroup` as opposed to the lowest common multiple of all of their lengths. This is best demonstrated by the following example. Using a pitch of `(0, 2, 4)` and delay of `(0, 0.5)` would play the whole chord twice whereas now it only delays the second value:
python
Old behaviour using lowest common multiple
p1 >> pluck((0, 2, 4), dur=PDur(3, 8), delay=(0, 0.5, 0, 0.5, 0, 0.5))

New behaviour
p1 >> pluck((0, 2, 4), dur=PDur(3, 8), delay=(0, 0.5))

- Improved efficiency of OSC message composition which should improve performance on lower-spec machines i.e. it can run reasonably well on a Rasberry Pi using a high clock latency value.
- Move the calculation of sustain using `blur` to SuperCollider such that using an effect such as `chop` that makes use of the sustain value no longer relies on `blur` as well:
python
Old behaviour required adjusting for the blur
p1 >> pluck(dur=PDur(3, 8), sus=2, blur=1.5, chop=4 * 1.5)

New behaviour still 'chops' the sound into 4 parts
p1 >> pluck(dur=PDur(3, 8), sus=2, blur=1.5, chop=4)

- Added `FoxDot.reload()` function to reload SynthDefs and samples in SuperCollider if FoxDot was started after having run `FoxDot.start` in SuperCollider. No longer requires you to close and re-open FoxDot.
- If SuperCollider is not open and a user tries to send a message from FoxDot, an error message is displayed. This now only happens once instead of after every message. This is to stop the console buffer filling up memory if the user is purposely not using SuperCollider.
- On bootup, check for newer versions of FoxDot available on PyPI and let the user know that they should update if so.

- Added `often`, `sometimes`, and `rarely` methods that wrap the `every` method but use random durations to decide when to call a method:
python
Stutter frequently
d1 >> play("x-o-").often("stutter", 4, dur=1)

Reverse sometimes
p1 >> pads([0, 1, 2, 3]).sometimes("reverse")

Call the solo method, but not frequently
p2 >> pluck((0,2,4), dur=PDur(3,8)).rarely("solo")

- Added Player keyword `quantise` to start playing as soon as possible when set to `True`. Defaults to `False` such that Players start playing at the next bar.
- Added menu options to allow users to set the CPU usage and Clock latency for better performance on individual systems.
- Fixed links to webpages from help menu for Linux and Mac OS.
- Added overdrive effect, which can be added using `drive` keyword