Ruler upgrades

• Add colouring based on proximity
• Add syntax to easily write harmonic series segments

Add ruler

• Adds the pitch ruler #17
• Dropped the default pitch down an octave because the syntax is better suited for pitching upward (either by using ' and ", or by just putting higher numbers in). Commonly saw people pitching their tunes down.
• Fixed link in readme

Add start position selectors, increase rendering perf during playback

• Add start position selector on left of each line in multiline tunes (partially addresses #1)
• Improve rendering performance of characters, now <0.3ms * 50fps instead of ~25ms * 20fps
• Add half finished code for pitch ruler

Fix mode parsing error, make errors nicer

• Fix mode parsing error #47
• Improve parser error messages #45

Embed, open source, modes, localstorage

• Share panel now has an iframe embed #6
• Code is now open source #35
• Adds modes #25
  • Major scale in 12 equal: {12edo}{m2 2 1 2 2 2 1} 0 1 2 3 4 5 6 7
• Added ability to loop (#1), although for now it can only loop the entire tune
• Last tune is stored in local storage so you dont accidentally lose your work #42
• Adds {bms:500} to set beat length in milliseconds #27

Underscore url fix, typing perf increase, error scrollbar fix

• Fixes #41
• Fixes #40
• Improved #37
• Improves typing responsiveness by decreasing number of AST parses via debouncing changes on the codearea by 200ms

Cursor jumping fix, undo / redo, mobile friendly layout

• Fixes "Typing or backspacing rapidly on mobile on large tunes can cause the cursor to jump to the end" #24
• Fixes "Bug: Copying and pasting xenpaper link into URL while on xenpaper does not change text" #39
• Adds "Improve layout on mobile" #37
• Adds "Add undo / redo buttons" #20

Syntax improvements, audio bug fixes, fb tags

• Occasionally the first note plays again right at the end #13
• Pressing stop will now immediately stop sound rather than just playhead #21
• Added better title and tags for Facebook links #23 #22
• Whitespace can be used wherever only commas could be used previously #26
• X\Y notation added for a pitch of a division of an octave #33
• Removed linking to xenp.io #34

sneaky break: replace ^ with ' for scale octave markers

Should have been changed with the syntax change for octave modifiers. Now the ^ symbol is truly freed up, and ' continues to mean "octave up" everywhere

Footer less intrusive on mobile, (root:...) example reference updated

1.0.1

Update README.md