Refactor Report Generation

[lucernae]

• Add default basemap settings
• Include @basemap layer order in default REPORT_LAYER_ORDER setting
• Refactor custom template finder and report generation
• Extract layer default styles to be used for the report

[codecov[bot]]

Codecov Report

Merging #474 into 2.8.x will increase coverage by 0.11%. The diff coverage is 61.7%.

@@            Coverage Diff             @@
##            2.8.x     #474      +/-   ##
==========================================
+ Coverage   56.27%   56.38%   +0.11%     
==========================================
  Files          47       47              
  Lines        2488     2513      +25     
  Branches      276      282       +6     
==========================================
+ Hits         1400     1417      +17     
- Misses       1016     1022       +6     
- Partials       72       74       +2

Impacted Files	Coverage Δ
default_settings.py	100% <100%> (ø)	:arrow_up:
tasks/analysis.py	59.33% <60.86%> (+0.57%)	:arrow_up:

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