Batch filter (solves #136)

[mateka]

Batch filter implementation: #136 .

[flexferrum]

Submodule 'thirdparty/nonstd/optional-lite' (https://github.com/martinmoene/optional-lite.git) registered for path 'thirdparty/nonstd/optional-lite'
Submodule 'thirdparty/nonstd/string-view-lite' (https://github.com/martinmoene/string-view-lite.git) registered for path 'thirdparty/nonstd/string-view-lite'
Submodule 'thirdparty/nonstd/variant-lite' (https://github.com/martinmoene/variant-lite.git) registered for path 'thirdparty/nonstd/variant-lite'
fatal: No url found for submodule path 'thirdparty/robin-hood-hashing' in .gitmodules

I suppose, the problem is that your branch wasn't properly rebased to the current master:

[codecov]

Codecov Report

Merging #150 into master will increase coverage by 0.3%.
The diff coverage is 95%.

@@            Coverage Diff            @@
##           master     #150     +/-   ##
=========================================
+ Coverage   88.14%   88.45%   +0.3%     
=========================================
  Files          65       65             
  Lines        8269     8515    +246     
=========================================
+ Hits         7289     7532    +243     
- Misses        980      983      +3

Impacted Files	Coverage Δ
src/filters.h	84.21% <ø> (+5.26%)	⬆️
test/filters_test.cpp	100% <100%> (ø)	⬆️
src/filters.cpp	87.95% <93.93%> (+0.59%)	⬆️
test/statements_tets.cpp	100% <0%> (ø)	⬆️
test/errors_test.cpp	99.21% <0%> (ø)	⬆️
src/template_parser.h	92.68% <0%> (+0.96%)	⬆️
src/lexer.h	95.57% <0%> (+1.05%)	⬆️
include/jinja2cpp/error_info.h	100% <0%> (+3.7%)	⬆️
src/error_info.cpp	63.01% <0%> (+4.68%)	⬆️
... and 1 more

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