Switch to new GitHub multi ISSUE_TEMPLATEs (#5492)

* Change to new Github Issue Templates

* Delete old ISSUE_TEMPLATE

* Remove commenting from templates and add custom/other template

.github/ISSUE_TEMPLATE/bug-report-.md

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+---
+name: Bug Report!
+about: Report a bug to help us fix it
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+Before opening an issue, please search for duplicates (opened and closed) https://github.com/valor-software/ngx-bootstrap/issues There's no need to open an issue here if you want to ask general question, use StackOverflow or Slack instead
+
+Bug description:
+
+Plunker/StackBlitz that reproduces the issue:
+
+
+Using Plunkr, StackBlitz is the best way to show your issue. Issues without link to an example of reproduction might be closed.
+
+You can use one of starter templates:
+
+Plunkr: https://plnkr.co/edit/0NipkZrnckZZROAcnjzB?p=preview
+
+StackBlitz: https://stackblitz.com/edit/ngx-bootstrap?file=app%2Fapp.module.ts
+
+Versions of ngx-bootstrap, Angular, and Bootstrap:
+
+ngx-bootstrap:
+
+Angular:
+
+Bootstrap:
+
+Build system: Angular CLI, System.js, webpack, starter seed:
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.

.github/ISSUE_TEMPLATE/feature-request-.md

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+---
+name: Feature Request!
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+
+A clear and concise description of what you want to happen.
+
+
+**Describe alternatives you've considered**
+
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+
+**Additional context**
+
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/something-else-.md

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+---
+name: Something Else?
+about: Use this to report something that you don't think fits in as a bug report or
+  a feature request!
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Description:**