Use serde to load config

[gnieto]

Use serde to load config files to make easier the config parsing. Should close: https://github.com/SUPERAndroidAnalyzer/super/issues/117

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[codecov[bot]]

Codecov Report

Merging #120 into develop will decrease coverage by 4.48%. The diff coverage is 60.56%.

@@             Coverage Diff             @@
##           develop     #120      +/-   ##
===========================================
- Coverage    58.37%   53.88%   -4.49%     
===========================================
  Files            6        6              
  Lines         2650     2353     -297     
===========================================
- Hits          1547     1268     -279     
+ Misses        1103     1085      -18

Impacted Files	Coverage Δ
src/config.rs	82.37% <52.94%> (-5.03%)	:arrow_down:
src/static_analysis/manifest.rs	26.19% <80%> (+0.34%)	:arrow_up:
src/main.rs	95.08% <80%> (-4.92%)	:arrow_down:
src/results/utils.rs	90% <0%> (-10%)	:arrow_down:

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[gnieto]

Pushed one more commit changing the config loading. As we are using serde_derive, it's not possible to mimic the previous behaviour: Load from /etc/config.toml, then decorate the config with the config.toml on the root and finally the CLI flags.

Now, it will try to load from /etc/config.toml if ran on Unix and config.toml non existing on the current path. On other platforms, config.toml is loaded if it exsits. If non of them exists, the default values are used.

Are you ok with the new behaviour?

[Razican]

I like the workflow, yes, but wasn't that the behaviour before?