Update issues templates (bug, feature, evt/dvt)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/evt-dvt-testing-issue.md

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+---
+name: EVT/DVT/Testing issue
+about: 'Issues during EVT/DVT/Testing/Dev '
+
+---
+
+### *Product:* (OC-SDR, OC-LTE, OC-LTE, OC-Power, All, N/A, others)
+   
+### *Component:* (PSU, GBC, BBU, FEM, LED, ME)
+
+### *Revision:* (A, B, C ...)
+
+### *Category: (schematic, layout, BoM, gerber, compliance, testing, documentation, etc.)
+
+### *Clearly explain the issue in detail, with snippets of schematic (or ref to the exact page), layout, etc, as needed*

.github/ISSUE_TEMPLATE/evt-dvt-testing-issues.md

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+---
+name: EVT/DVT/Testing issues
+about: 'Issues during EVT/DVT/Testing/Dev '
+
+---
+
+### *Product:* (OC-SDR, OC-LTE, OC-LTE, OC-Power, All, N/A, others)
+   
+### *Component:* (PSU, GBC, BBU, FEM, LED, ME)
+
+### *Revision:* (A, B, C ...)
+
+### *Category: (schematic, layout, BoM, gerber, compliance, testing, documentation, etc.)
+
+### *Clearly explain the issue in detail, with snippets of schematic (or ref to the exact page), layout, etc, as needed*

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea/new feature for OpenCellular
+
+---
+
+### *Product:* (OC-SDR, OC-LTE, OC-LTE, OC-Power, others)
+   
+### *Component:* (PSU, GBC, BBU, FEM, LED, ME)
+   
+### *Category:*
+   - [ ] Hardware
+   - [ ] Software/stack
+   - [ ] Firmware/bootloader 
+   - [ ] Documentation
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen. Ex. Band28 FEM support for LTE [...]
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.