Remove Tango
fix @property for allowDrop(setter property)
Fix some compilation errors

In dmd 2.060, some lines cause compilation errors.
So, I fixed these errors.
Fix error handling
Updates for dfl.exe compile under 2.060
Changes to compile NO_MDI and DFL_NO_MENUS
Changes so it works
Properly parse DMD out for latest compilers
Some fix

D&D
property
switch-case-fallthrough
followed dmd git head

`const XXX` to `enum XXX`
`newary[a..b] = ary;` was gone.
std.path.pathsep is deprecatred
follow dmd2.063
Add package.d (in specific of dmd 2.064a)
add package.d to makelib.bat
Fixed utf32stringtoUtf8string declaration.
Color supports CTFE
Liker flag PAGESIZE is now 128.