Add Robot Framework syntax highlighting

[SullyJHF]

Issue #, if available:
#4489
Description of changes:
Add Robot Framework syntax highlighting.

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[nightwing]

Looks like tests are failing because of using lookbehind in a regex. If you are not planning to support safari https://caniuse.com/?search=Lookbehind, i can modify the test runner to allow this failure on old versions of node and merge this pull request.

[SullyJHF]

I think I've managed to remove the lookbehinds in the regexes, and the functionality is the same, so no worries on that one!

However, I'm now trying to add some snippets to this, but for some reason they aren't autocompleting in the kitchen sink demo, I've tested the python ones and they are completing correctly, but for some reason the robot framework ones aren't. Could you please look at the latest commit and advise as to what to do here?

[SullyJHF]

Can you provide any assistance with this please?

[nightwing]

Sorry i have missed this, the snippets in your commit don't work because they are indented with spaces instead of tabs.

[SullyJHF]

Thanks for the help, I've changed the indentation to tabs and now the snippets behave as expected! Also fixed an error where some keywords were getting highlighted in the middle of words. I think this is good to go for merging now!

[codecov]

Codecov Report

Merging #4614 (843c017) into master (a1ae7e5) will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4614      +/-   ##
==========================================
+ Coverage   71.01%   71.19%   +0.18%     
==========================================
  Files         546      555       +9     
  Lines       55303    55597     +294     
  Branches    10376    10398      +22     
==========================================
+ Hits        39272    39581     +309     
+ Misses      16031    16016      -15     

Flag	Coverage Δ
unittests	71.19% <100.00%> (+0.18%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/ace/mode/robot.js	100.00% <100.00%> (ø)
lib/ace/mode/robot_highlight_rules.js	100.00% <100.00%> (ø)
lib/ace/ext/language_tools.js	69.91% <0.00%> (-2.99%)	⬇️
lib/ace/tokenizer.js	95.12% <0.00%> (-0.45%)	⬇️
lib/ace/ext/beautify.js	96.31% <0.00%> (-0.30%)	⬇️
lib/ace/mode/csound_orchestra_highlight_rules.js	97.61% <0.00%> (ø)
lib/ace/mode/partiql_highlight_rules.js	100.00% <0.00%> (ø)
lib/ace/mode/partiql.js	75.86% <0.00%> (ø)
lib/ace/ext/hardwrap_test.js	98.46% <0.00%> (ø)
lib/ace/mode/sac_highlight_rules.js	100.00% <0.00%> (ø)
... and 9 more

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