Move str -> bool parsing to text util

[codecov[bot]]

Codecov Report

Merging #609 into gonzobot will increase coverage by 0.94%. The diff coverage is 91.66%.

@@             Coverage Diff              @@
##           gonzobot     #609      +/-   ##
============================================
+ Coverage     54.54%   55.49%   +0.94%     
============================================
  Files           232      235       +3     
  Lines         14208    14431     +223     
============================================
+ Hits           7750     8008     +258     
+ Misses         6458     6423      -35

Impacted Files	Coverage Δ
cloudbot/util/text.py	100% <100%> (ø)
plugins/core/optout.py	32.29% <50%> (+9.65%)	:arrow_up:
cloudbot/util/web.py	99.54% <0%> (-0.46%)	:arrow_down:
tests/plugin_tests/test_optout.py	100% <0%> (ø)	:arrow_up:
plugins/link_announcer.py	100% <0%> (ø)	:arrow_up:
tests/core_tests/util_tests/test_web.py	100% <0%> (ø)	:arrow_up:
tests/plugin_tests/conftest.py	100% <0%> (ø)	:arrow_up:
tests/core_tests/test_plugin_manager.py	100% <0%> (ø)	:arrow_up:
tests/plugin_tests/test_core_connect.py	100% <0%> (ø)	:arrow_up:
tests/plugin_tests/test_link_announcer.py	100% <0%> (ø)	:arrow_up:
... and 23 more

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