Treat Emoji like stop characters

[PatrickLerner]

Closes #43

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/text_state/tests.rs	92.85%	6 Missing ⚠️
src/ui.rs	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/text_state/mod.rs	29.71% <100.00%> (ø)
src/ui.rs	0.00% <0.00%> (ø)
src/text_state/tests.rs	92.85% <92.85%> (ø)

... and 2 files with indirect coverage changes

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