Ant fails to compile on Windows due to encoding issue

[sigma67]

Trying to compile the latest Textidote myself on Windows (due to lack of a release including recent bugfixes), I ran into an encoding issue (error message below). This PR fixes it.

compile:
    [javac] Compiling 37 source files to C:\Users\LocalAdmin\IdeaProjects\textidote\Source\Core\bin
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 1.6
    [javac] C:\Users\LocalAdmin\IdeaProjects\textidote\Source\Core\src\ca\uqac\lif\textidote\cleaning\latex\LatexCleaner.java:440: error: unmappable character for encoding Cp1252
    [javac]             as_out = as_out.replaceAll("\\\\'\\{A\\}", "├?");
    [javac]                                                          ^
    [javac] C:\Users\LocalAdmin\IdeaProjects\textidote\Source\Core\src\ca\uqac\lif\textidote\cleaning\latex\LatexCleaner.java:456: error: unmappable character for encoding Cp1252
    [javac]             as_out = as_out.replaceAll("\\\\'\\{I\\}", "├?");
    [javac]                                                          ^
    [javac] C:\Users\LocalAdmin\IdeaProjects\textidote\Source\Core\src\ca\uqac\lif\textidote\cleaning\latex\LatexCleaner.java:482: error: unmappable character for encoding Cp1252
    [javac]             as_out = as_out.replaceAll("\\\\'A", "├?");
    [javac]                                                    ^
    [javac] C:\Users\LocalAdmin\IdeaProjects\textidote\Source\Core\src\ca\uqac\lif\textidote\cleaning\latex\LatexCleaner.java:498: error: unmappable character for encoding Cp1252
    [javac]             as_out = as_out.replaceAll("\\\\'I", "├?");
    [javac]                                                    ^
    [javac] 4 errors
    [javac] 1 warning

BUILD FAILED