More templatetags

[blag]

Re-implement #133.

Description

Add the platform and browser template tags, and utilize them within the device template tag.

Motivation and Context

This makes it easier to separate pieces of a user agent when displaying to a user.

Closes #133.

How Has This Been Tested?

Added tests for each new template tag. The data for the tests is the same data as for the device tag, since it uses the same data.

I completely decoupled the three test cases (PlatformTemplateFilterTest, BrowserTemplateFilterTest, and DeviceTemplateFilterTest) since I didn't want changes to one to affect the other.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #165 (2130fe5) into master (322c88b) will increase coverage by 0.79%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   91.82%   92.62%   +0.79%     
==========================================
  Files          16       16              
  Lines         673      746      +73     
  Branches       48       50       +2     
==========================================
+ Hits          618      691      +73     
  Misses         45       45              
  Partials       10       10              

Files	Coverage Δ
tests/tests.py	98.36% <100.00%> (+0.32%)	⬆️
user_sessions/templatetags/user_sessions.py	71.66% <100.00%> (+4.35%)	⬆️

... and 1 file with indirect coverage changes

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[WhyNotHugo]

LGTM. No obvious issues here.