Some fixes and upgrade to Android 29 sdk

[gnieto]

This contains an upgrade to android 29 SDK and a couple of fixes:

• Use a HashMap instead of a Vector to store type specs: This fixes type specs which appears out-of-order or which are non-sequential.
• Use a proper width to store the number of attributes: This fixes some cases in which the returned number of attributes were extremely large, caused by a parsing error

[Razican]

It seems that tests are failing due to a lacking cargo fmt.

[codecov[bot]]

Codecov Report

Merging #69 into master will decrease coverage by 0.47%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage   90.05%   89.58%   -0.48%     
==========================================
  Files          34       34              
  Lines        2736     2785      +49     
==========================================
+ Hits         2464     2495      +31     
- Misses        272      290      +18

Impacted Files	Coverage Δ
src/visitor/xml.rs	80% <ø> (-1.5%)	:arrow_down:
src/model/mod.rs	97.14% <ø> (ø)	:arrow_up:
src/chunks/table_type/mod.rs	96.58% <100%> (+3.18%)	:arrow_up:
src/chunks/xml.rs	93.39% <100%> (+0.3%)	:arrow_up:
src/visitor/model.rs	58.16% <77.77%> (-2.99%)	:arrow_down:

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