#362: Double escaping of query parameters

[proshin-roman]

As the underlying HTTP client already does escaping of query parameters, it's not required to have QueryParamEncodedPair anymore. Instead, I've renamed it to PlainNameValuePair that doesn't do any escaping anymore.

[codecov]

Codecov Report

Merging #372 (77ef134) into master (a322379) will not change coverage.
The diff coverage is 92.96%.

@@            Coverage Diff            @@
##             master     #372   +/-   ##
=========================================
  Coverage     83.94%   83.94%           
  Complexity     1043     1043           
=========================================
  Files           176      176           
  Lines          2572     2572           
  Branches         20       20           
=========================================
  Hits           2159     2159           
  Misses          395      395           
  Partials         18       18           

Impacted Files	Coverage Δ	Complexity Δ
.../java/org/proshin/finapi/mandator/FpIbanRules.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...va/org/proshin/finapi/mandator/FpKeywordRules.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/org/proshin/finapi/user/FpUsers.java	100.00% <ø> (ø)	11.00 <0.00> (ø)
...ntial/in/QueryTppAuthenticationGroupsCriteria.java	60.00% <40.00%> (ø)	4.00 <1.00> (ø)
.../tppcredential/in/QueryTppCredentialsCriteria.java	81.81% <66.66%> (ø)	4.00 <1.00> (ø)
.../org/proshin/finapi/mandator/in/UsersCriteria.java	94.87% <93.33%> (ø)	18.00 <12.00> (ø)
...oshin/finapi/account/in/DailyBalancesCriteria.java	100.00% <100.00%> (ø)	10.00 <5.00> (ø)
...org/proshin/finapi/account/in/FpQueryCriteria.java	100.00% <100.00%> (ø)	11.00 <5.00> (ø)
...java/org/proshin/finapi/bank/in/BanksCriteria.java	92.85% <100.00%> (ø)	13.00 <8.00> (ø)
.../proshin/finapi/category/in/CashFlowsCriteria.java	100.00% <100.00%> (ø)	22.00 <17.00> (ø)
... and 10 more

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