Replace look with lookText' in controller modules

[Purplegaze]

Proposed Changes

Replaces look with lookText in Controllers/Graph and Controllers/Timetable.

BC.pack is replaced with TE.encodeUtf8 in a related function; this is backwards compatible since BC.pack works on ASCII and all ASCII is valid UTF8.

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Screenshots of your changes (if applicable)

Type of Change

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Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)	X
🚦 Test update (change that only adds or modifies tests)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

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Before opening your pull request:

• I have performed a self-review of my changes.
  • Check that all changed files included in this pull request are intentional changes.
  • Check that all changes are relevant to the purpose of this pull request, as described above.
• I have added tests for my changes, if applicable.
  • This is required for all bug fixes and new features.
• I have updated the project documentation, if applicable.
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  • I think this can be considered part of the "Refactored various backend functions to use Text instead of String" line that's already in the changelog for this update

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Questions and Comments

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[coveralls]

Pull Request Test Coverage Report for Build f62b14df-2719-4a15-a9db-973c1de81d2c

Details

• 0 of 2 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 56.524%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/Controllers/Graph.hs	0	1	0.0%
app/Export/GetImages.hs	0	1	0.0%

Totals
Change from base Build ac1c0723-45d7-45be-8bea-efc2c6525e84:	0.0%
Covered Lines:	2280
Relevant Lines:	3956

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💛 - Coveralls