* issue template update
- add issue validation inspired by https://github.com/ChrisTitusTech/linutil/pull/459
- standardize capitalisation of characters in titles
- update feature request to use headers instead of bold text for titles
* use "I checked" for Issue validation
* Change the titles for each section from Bold Text to Header 3 in Bug Report Issue Template
* Change the Titles Header from Level 3 to Level 2 in 'Bug Report' Issue Template