improved: Delphi 2007 project file added
refactoring: use 'const' keyword
refactoring: removed unused TCustomDelphiTask.ReadMachineOption
imroved: log Want version

Also, copyright year corrected.
improved: log searching Delphi tools

Registry searching paths are now visible in debug mode.
refactoring: introduce TCustomDelphiTask.ReadOption
v0.11.75: improved: allow "manual" Delphi installation

For Delphi path detection registry root key HKEY_LOCAL_MACHINE is used,
and for LibraryPath is HKEY_CURRENT_USER. During setup of some CI build
server we ussually do not want to install Delphi and just copy command
line tools and modify registry keys concerning LibraryPath. So, let Want
be able to detect Delphi path in HKEY_CURRENT_USER registry root, too,
no appropriate keys set in HKEY_LOCAL_MACHINE.