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.
Adds default parameters to the constructor of DflException

It is convenient that an exception has the location information  where
it was created and thrown. This patch adds default parameters, __FILE__
and __LINE__, to DflException's constructor like other Exception
classes.