Add sharezone_lints to sharezone_common

[nilsreichardt]

Fixes as well:

Analyzing sharezone_common...                                           

   info • Don't invoke 'print' in production code • lib/src/api_errors/api_errors.dart:220:9 • avoid_print
   info • Statements in an if should be enclosed in a block • lib/src/api_errors/api_errors.dart:240:5 •
          curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/api_errors/api_errors.dart:242:5 •
          curly_braces_in_flow_control_structures
   info • Statements in a for should be enclosed in a block • lib/src/database_foundation.dart:79:11 • curly_braces_in_flow_control_structures
   info • Statements in a for should be enclosed in a block • lib/src/database_foundation.dart:81:11 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:85:11 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:87:11 • curly_braces_in_flow_control_structures
   info • Statements in a for should be enclosed in a block • lib/src/database_foundation.dart:89:11 • curly_braces_in_flow_control_structures
   info • Statements in a for should be enclosed in a block • lib/src/database_foundation.dart:91:11 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:104:43 •
          curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:105:7 • curly_braces_in_flow_control_structures
   info • Statements in a for should be enclosed in a block • lib/src/database_foundation.dart:110:7 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:150:7 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:156:7 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:158:7 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:165:7 • curly_braces_in_flow_control_structures
   info • Statements in a for should be enclosed in a block • lib/src/database_foundation.dart:223:9 • curly_braces_in_flow_control_structures
   info • Statements in a for should be enclosed in a block • lib/src/database_foundation.dart:225:9 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:237:43 •
          curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/database_foundation.dart:238:7 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/helper_functions.dart:19:5 • curly_braces_in_flow_control_structures
   info • Statements in an if should be enclosed in a block • lib/src/helper_functions.dart:29:5 • curly_braces_in_flow_control_structures
   info • Unnecessary escape in string literal • lib/src/helper_functions.dart:50:45 • unnecessary_string_escapes

23 issues found. (ran in 1.6s)

Part of #37

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