Update JvDesignImp.pas

CanInsertComponent is needed for Delphi XE7, there it can be found in interface IDesignerNotify. This method was added in XE7.
As it simply is not used in older versions of Delphi, we only have to add it without taking steps for previous versions.
Merge pull request #20 from jaenicke/patch-1

Update JvDesignImp.pas
Introduced the "USE_BDE" define because XE7 does not provide the BDE by default
Inc files for XE7
Check has been done
TLabel.Caption was set to TLabel.Name
Updated CompInstall.dll from JCL
Removed old jvclbase.inc entries that were renamed and are auto-defined in jvcl.inc