Easy access for TNamed value via getindex

[tamasgal]

Fixes #397 by simply returning the fTitle field of a TNamed object when access through getindex (i.e. ROOTFile["..."])

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.30%. Comparing base (65c125c) to head (e786f34).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/root.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #398      +/-   ##
==========================================
- Coverage   84.32%   84.30%   -0.03%     
==========================================
  Files          23       23              
  Lines        3107     3109       +2     
==========================================
+ Hits         2620     2621       +1     
- Misses        487      488       +1     

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