Added frontlogo switch (custom logo)

Added frontlogo switch for custom frontlogo.

Example (settings.tex):

%% Use custom frontlogo \frontlogo{logo/eis.png}

liuthesis.cls

@@ -6,9 +6,9 @@
 %% Maintainer:
 %% Created: Fri Mar 20 08:25:23 2009 (CET)
 %% Version:
-%% Last-Updated: Mon Apr 16 15:04:30 2018 (+0200)
-%%           By: Ola Leifler
-%%     Update #: 1560
+%% Last-Updated: Sat May  4 11:51:02 2019 (+0200)
+%%           By: Fredrik Lindeberg
+%%     Update #: 1567
 %% URL:
 %% Keywords:
 %% Compatibility:
@@ -127,6 +127,11 @@
 \createvariable{thesissubject}
 \createvariable{thesissubjectenglish}
 
+% Frontlogo
+\newif\iffrontlogo
+\frontlogofalse
+\def\frontlogo#1{\frontlogotrue\gdef\@frontlogo{#1}}
+
 \newif\ifsubtitleswedish
 \subtitleswedishfalse
 \def\subtitleswedish#1{\subtitleswedishtrue\gdef\@subtitleswedish{#1}}
@@ -737,7 +742,11 @@
 \vfill{}
 \begin{textblock*}{\textwidth}(2cm,\paperheight-4cm)
   \swedishenglish{\gdef\@langlogo{sv}}{\gdef\@langlogo{en}}
+  \iffrontlogo
+  \parbox{0.4\textwidth}{\includegraphics[width=85mm]{\@frontlogo}}%
+  \else
   \parbox{0.4\textwidth}{\includegraphics[width=85mm]{liu_primary_black_\@langlogo}}%
+  \fi
   \hspace*{32mm}
   \parbox{0.5\textwidth}{\raggedleft%
     \vspace*{4mm}
@@ -764,8 +773,12 @@
      {\LARGE\bfseries\gettitle}\\[20mm]
      {\Large\bfseries\@author}\\
      \vfill
-    \swedishenglish{\gdef\@langlogo{sv}}{\gdef\@langlogo{en}}
-    \includegraphics[width=60mm]{liu_primary_black_\@langlogo}
+     \swedishenglish{\gdef\@langlogo{sv}}{\gdef\@langlogo{en}}
+     \iffrontlogo
+     \includegraphics[width=85mm]{\@frontlogo}
+     \else
+     \includegraphics[width=60mm]{liu_primary_black_\@langlogo}
+     \fi
    \\[12mm]
      {\footnotesize
      \swedishenglish{%