use less memory by structs

[jkralik]

Installed tool:
go install golang.org/x/tools/go/analysis/passes/fieldalignment/cmd/fieldalignment@latest

We need to be careful with atomic.Int64 and atomic.Uint64 for ARM,MIPs 32bit

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #428 (1890800) into jkralik/fix/bwt-race (32d2520) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@                   Coverage Diff                    @@
##           jkralik/fix/bwt-race     #428      +/-   ##
========================================================
+ Coverage                 71.50%   71.54%   +0.03%     
========================================================
  Files                        70       70              
  Lines                      5496     5496              
========================================================
+ Hits                       3930     3932       +2     
+ Misses                     1173     1172       -1     
+ Partials                    393      392       -1     

Impacted Files	Coverage Δ
dtls/server/config.go	71.42% <ø> (ø)
dtls/server/server.go	76.47% <ø> (ø)
dtls/server/session.go	81.69% <ø> (ø)
message/message.go	80.00% <ø> (ø)
message/pool/message.go	75.87% <ø> (ø)
message/pool/pool.go	92.00% <ø> (ø)
mux/router.go	63.63% <ø> (ø)
...ent/limitParallelRequests/limitParallelRequests.go	92.75% <ø> (ø)
net/conn.go	89.06% <ø> (+1.56%)	⬆️
net/connUDP.go	59.76% <ø> (-0.79%)	⬇️
... and 25 more

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