extra modules should be explicitly specified

• There is change in installation of extra modules.
  Now user should specify a modules with '-m' option if necessary.
  It installs all of extra modules in v0.5.x and prior versions.
• Support for WebAssembly component installation.

Change target directory as same as GUI installer / Tools installation

• Now support Tools installation such as mingw, ifw etc.
• Change target directory as same as GUI installer.
  when specifying '--outputdir C:\Qt' then library will be in 'C:\Qt\5.11.3\msvc2017_x86[lib, bin, ...]'.
  This behavior is different from v0.4.3 and prior versions.

Fix for installation target directory

Now target directory becomes without 'Qt' folder.

That means when specify --outputdir C:\Qt libraries will be installed in C:\Qt\5.11.3\... as same as GUI installer does.

Support Qt Library and Tools Installation

Prepare for v0.5b1

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

Qt Library Installation for Windows, Linux and Mac

Prepare for v0.4.3

Signed-off-by: Hiroshi Miura <miurahr@linux.com>