Fix deprecation warnings related to regex library

[auxym]

C:\Users\Francis\source\svd2nim\src\utils.nim(41, 8) Warning: use re2(static string) instead; re is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\utils.nim(42, 8) Warning: use re2(static string) instead; re is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\utils.nim(43, 8) Warning: use re2(static string) instead; re is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\utils.nim(46, 21) Warning: use replace(string, Regex2, string) instead; replace is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\utils.nim(60, 15) Warning: use re2(static string) instead; re is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\utils.nim(61, 5) Warning: use replace(string, Regex2, string) instead; replace is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\svdparser.nim(196, 13) Warning: use re2(static string) instead; re is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\svdparser.nim(199, 19) Warning: use match(string, Regex2, var RegexMatch2) instead; match is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\svdparser.nim(200, 20) Warning: group is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\svdparser.nim(201, 20) Warning: group is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\codegen.nim(838, 13) Warning: use re2(static string) instead; re is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\codegen.nim(840, 30) Warning: use match(string, Regex2, var RegexMatch2) instead; match is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\codegen.nim(842, 15) Warning: group is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\codegen.nim(843, 15) Warning: group is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\codegen.nim(854, 41) Warning: use re2(static string) instead; re is deprecated [Deprecated]
C:\Users\Francis\source\svd2nim\src\codegen.nim(854, 33) Warning: use replace(string, Regex2, string) instead; replace is deprecated [Deprecated]