Configuration Manager

[jaycedowell]

This PR adds a configuration manager to LSL to make it easier for users to change the internal behavior of the code. The configuration manager controls:

• auto-filling of lsl.common.sdf Observer and Project classes via a new autofilled class method,
• lsl.reader.ldp buffer sizes,
• lsl.reader.ldp.DRXFile missing data zero filling,
• ionospheric data download URLs and cache size,
• whether or not telemetry reporting is enabled, and
• download block size and timeouts.

[coveralls]

Coverage increased (+2.6%) to 82.741% when pulling b58fa47c7d2957e7304c84bd513ae601401beb12 on config-manager into 9f4ecb7213862d1728043b8c2529b236d7d6cc0a on master.

[codecov[bot]]

Codecov Report

Merging #14 into master will decrease coverage by 0.50%. The diff coverage is 44.95%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   83.36%   82.85%   -0.51%     
==========================================
  Files          65       66       +1     
  Lines       21406    21663     +257     
==========================================
+ Hits        17845    17949     +104     
- Misses       3561     3714     +153     

Impacted Files	Coverage Δ
lsl/common/idf.py	86.91% <25.00%> (-0.46%)	:arrow_down:
lsl/misc/ionosphere.py	69.52% <30.43%> (-1.63%)	:arrow_down:
lsl/common/sdf.py	85.89% <31.25%> (-0.49%)	:arrow_down:
lsl/config.py	48.11% <48.11%> (ø)
lsl/astro.py	83.43% <50.00%> (+0.03%)	:arrow_up:
lsl/misc/telemetry.py	78.39% <50.00%> (-6.55%)	:arrow_down:
lsl/reader/ldp.py	80.11% <85.71%> (+0.02%)	:arrow_up: