Syntax update

[ehuss]

Broad overview of changes:

• Update the syntax to use Sublime's new sublime-syntax format.
• Add complete support for everything in TOML 0.4 and be a little more robust in rejecting invalid syntax.
• Update some scopes to match Sublime's naming convention.
• (Bonus) Add local Goto Symbol support.

This fixes #6 and #5.

Detailed changes:

• Boolean: Change scope constant.other.boolean to constant.language.

• Integer/Float:

  • Support _ separator.
  • Assign keyword.operator.arithmetic to +- prefix.
  • Reject 0. and accept +0 and -0.

• Datetime: Support all variants.

• Strings:

  • Give escapes specific constant.character.escape scope, and reject invalid escapes.
  • Give the begin/end quotes separate scopes punctuation.definition.string.begin/end
  • Change scope of "double quoted strings" from string.quoted.*single* to string.quoted.*double*.

• Key/value:

  • Key scope changed to entity.name.tag from keyword.key.
  • Equals scope changed to punctuation.definition.key-value from punctuation.definition.keyValuePair.
  • Keys now use the "string" contexts to better handle strings (such as escape highlighting).
  • Don't aggressively red-highlight while typing a key.

• Array:

  • Give the open/close brackets separate punctuation.definition.array.begin/end scopes.
  • Give , separator the punctuation.separator.array scope.
  • Better rejection of invalid arrays.

• Inline-table:

  • Give the open/close brackets separate punctuation.definition.inline-table.begin/end scopes.
  • Give , separator the punctuation.separator.inline-table scope.
  • Better rejection of invalid inline tables.

• Table names:

  • Remove meta.tag.table (it was scoping the entire file).
  • Change name scope to entity.name.table from entity.other.attribute-name.table.
  • Support comments after the table name.
  • Give opening/closing brackets separate punctuation.definition.table.begin/end scopes.
  • Support quoted names in tables.
  • Support spaces separating parts of table name.

[slimsag]

Would be great to get this merged in! Looks like there are a lot of valuable improvements made here

[hinxx]

Works as expect for me! Thanks!

[FichteFoll]

Big thanks to you, @ehuss! Now the syntax is actually usable 👍