Tidy up

[Ozaq]

This PR enables a few more tidy checks and addresses them. Additionally it adds a way for git blame to ignore changed from our big reformatting.

Removed unneeded if
There is no need to null check a pointer before deleting because 'delete
ptr' where prt = nullptr is a NO-OP.

Add .git-blame-ignore-revs
'git blame' can be configured to ignore specific commits such as
reformatting the codebase with clang format.

We track the commits we want to be ignored in .git-blame-ignore-revs.

You can use git blame from the cli with:
git blame --ignore-revs-file .git-blame-ignore-revs

Or you configure your git config to always use .git-blame-ignore-revs by
setting:
git config blame.ignoreRevsFile .git-blame-ignore-revs

Or extending your gitconfig with:

[blame]
ignoreRevsFile = .git-blame-ignore-revs

Note that .git-blame-ignore-revs is recognized by GitHub.

Introduce tidy bugprone-use-after-move
Move- constructor / assignment operator can be defaulted in this case.
Silencing the use-after-move warning. In this specific case there was no
bug in the existing code because we moved only the base class part.

Add aditional tidy checks

• bugprone-assignment-in-if-condition
• bugprone-bool-pointer-implicit-conversion
• bugprone-unused-return-value,

Added new tidy-check and fixed warning
Added bugprone-casting-through-void

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 63.89%. Comparing base (9e8f9d5) to head (6153927).

Files with missing lines	Patch %	Lines
src/fdb5/remote/server/ServerConnection.cc	0.00%	3 Missing ⚠️
src/fdb5/io/FieldHandle.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #98      +/-   ##
===========================================
- Coverage    63.90%   63.89%   -0.01%     
===========================================
  Files          281      281              
  Lines        15809    15804       -5     
  Branches      1644     1642       -2     
===========================================
- Hits         10102    10098       -4     
+ Misses        5707     5706       -1     

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[Ozaq]

@simondsmart I talked to @wdeconinck and @pmaciel about https://clang.llvm.org/extra/clang-tidy/checks/readability/delete-null-pointer.html and the resonance was positive.