Add -path option for injector (#2)

[rougemeilland]

This is a proposed fix for issue #2.

By specifying -path <initial directory path name> as a command argument for Dll_Injector.exe, you can change the initial value of the directory where images are saved.
The -path command argument is optional.

By the way, the code page of the original common.h was not UNICODE, and it contained comments in simplified Chinese.
When I edited common.h, there was a possibility of garbled characters, so I changed the code page to UTF8 with BOM.
note that.

[JamesHoi]

A pull request should be focused to one issue. I think the chinese comment should be removed or change to english but not in this PR.

[rougemeilland]

The code page of common.h before editing was EUC (Simplified Chinese), and in my development environment I could not edit it without causing garbled characters.

Therefore, I changed the code page to UTF-8 and translated the comments to English.

please confirm.

[JamesHoi]

Single dash usually use in the short form of argument option, I think it is better to use two dash like --path.

[JamesHoi]

Also, this dumper is not for CLI user and thats why I use gui to choose save directory. I am not quite sure this PR is the best way to let user choose the initial save directory.

For example, if I am a CLI user, why do I just use the argument like --path as the saving directory. On the other hand, if I am a user who doesnt know about CLI, why this software cannot automatically choose the last saving directory as the initial path. In my opinion, the argument of initial path is totally useless.

[rougemeilland]

As you pointed out, I changed the command argument from "-path" to "--path".

I would also like to answer why I am particular about specifying command arguments.

I also have no intention of using Dll_Injector.exe with the CLI.
The reason why you want to specify it as a command argument is because you are considering running it from a shortcut.

When you run Dll_Injector.exe from Explorer or from a shortcut pasted on the desktop, the list under the desktop is always displayed as the destination for saving images.

As mentioned above, I wanted to save images in a dedicated directory, and having to reselect the directory every time I started Dll_Injector.exe was very tedious.

If you can specify the initial directory where the image will be saved using the Dll_Injector.exe command argument, you can save the above effort by specifying the command argument along with the full path name of the executable file in the shortcut properties.

As another workaround, I considered a method of ``displaying the last selected directory first at next startup,'' but I ultimately gave up on this method due to the following requirements. .

• Concerns about the amount of modification for the code that saves the “last selected directory path name”
• Where to save the "last selected directory path name".

[JamesHoi]

I have totally understand the situation but I dont think implementing of saving software settings need a lot of modifications. I think use windows regedit for saving and loading settings just need little changes.

PS: You should always deal with one problem in one PR, we should solve the common.h file encoding issue in another PR but still thanks you for improving this repo.