Wrong absolute paths
**Im using cmake to generate font in build steps, cmake fills the input and output directories.
There is no problem with cmake commands,  This program (svgtofont) goes wrong with absolute paths.**


### cmake definitions:

```
set(SVG_ICONS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/resources/svgFont/svg)
set(FONTICONS_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/generated_font)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/resources/svgFont/package.json.in ${CMAKE_CURRENT_BINARY_DIR}/package.json)
```

### package.json.in file:

```
//  /home/.../project/fonts/package.json.in
"scripts": {
    "font": "svgtofont --sources @SVG_ICONS_DIR@ --output @FONTICONS_OUTPUT_DIR@"
  }
```

### generated package.json file:

```
//   /home/.../project_build/fonts/package.json
"scripts": {
    "font": "svgtofont --sources  /home/.../project/fonts/svg --output  /home/.../project_build/generated_font"
  }
```

### error:
```The directory does not exist! /home/.../project_build/home/.../project/fonts/svg```

It appends input path to running path ( the result is someting like this `` /home/.../project_build/home/.../project/fonts/svg``) 


A real example:

```
[user1@fedora GUI]$ npm run font

> font
> svgtofont --sources /home/user1/projects/MainApp/plugins/GUI/resources/svgFont/svg --output /home/user1/builds/build-MainApp-Desktop_Qt_5_15_2_GCC_64bit-Debug/plugins/GUI/generated_font

The directory does not exist! /home/user1/builds/build-MainApp-Desktop_Qt_5_15_2_GCC_64bit-Debug/plugins/GUI/home/user1/projects/MainApp/plugins/GUI/resources/svgFont/svg

```

**I even tested it without cmake and it still had this problem.**