FIX: Relative path for saving

[dipinknair]

Currently for App.save() or save_as needs absolute path. This PR looks into possibility of saving file to current working directory if relative path is provided.

Fixes #211

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.15% (target: -1.00%)	✅ 55.56%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (d2101ec)	2557	2197	85.92%
Head commit (4d2480d)	2566 (+9)	2201 (+4)	85.78% (-0.15%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1253)	9	5	55.56%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.77%. Comparing base (d2101ec) to head (4d2480d).

❌ Your patch check has failed because the patch coverage (55.55%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1253      +/-   ##
==========================================
- Coverage   85.92%   85.77%   -0.15%     
==========================================
  Files          39       39              
  Lines        2557     2566       +9     
==========================================
+ Hits         2197     2201       +4     
- Misses        360      365       +5     

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