groot: implement new rfunc-gen default type name convention

[sbinet]

Updates #737.

[codecov]

Codecov Report

Merging #742 into master will increase coverage by 0.02%.
The diff coverage is 92.63%.

@@            Coverage Diff             @@
##           master     #742      +/-   ##
==========================================
+ Coverage   71.49%   71.52%   +0.02%     
==========================================
  Files         384      384              
  Lines       48912    49079     +167     
==========================================
+ Hits        34972    35104     +132     
- Misses      11684    11719      +35     
  Partials     2256     2256              

Impacted Files	Coverage Δ
groot/internal/genroot/genrfunc.go	65.97% <44.92%> (-9.03%)	⬇️
groot/rdict/rdict.go	92.48% <100.00%> (+0.56%)	⬆️
groot/rtree/rfunc/rfunc_bool_gen.go	100.00% <100.00%> (ø)
groot/rtree/rfunc/rfunc_f32_gen.go	100.00% <100.00%> (ø)
groot/rtree/rfunc/rfunc_f64_gen.go	100.00% <100.00%> (ø)
groot/rtree/rfunc/rfunc_f64s_gen.go	100.00% <100.00%> (ø)
groot/rtree/rfunc/rfunc_i32_gen.go	100.00% <100.00%> (ø)
groot/rtree/rfunc/rfunc_i64_gen.go	100.00% <100.00%> (ø)
groot/rtree/rfunc/rfunc_u32_gen.go	100.00% <100.00%> (ø)
groot/rtree/rfunc/rfunc_u64_gen.go	100.00% <100.00%> (ø)
... and 3 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4d1e5f0...020b43e. Read the comment docs.