implement basic set of tests for tcl_shell, need to be completed

tests/gerber_files/detector_copper_top.gbr

@@ -0,0 +1,71 @@
+G04 MADE WITH FRITZING*
+G04 WWW.FRITZING.ORG*
+G04 DOUBLE SIDED*
+G04 HOLES PLATED*
+G04 CONTOUR ON CENTER OF CONTOUR VECTOR*
+%ASAXBY*%
+%FSLAX23Y23*%
+%MOIN*%
+%OFA0B0*%
+%SFA1.0B1.0*%
+%ADD10C,0.075000*%
+%ADD11C,0.099055*%
+%ADD12C,0.078740*%
+%ADD13R,0.075000X0.075000*%
+%ADD14C,0.024000*%
+%ADD15C,0.020000*%
+%LNCOPPER1*%
+G90*
+G70*
+G54D10*
+X1149Y872D03*
+X1349Y872D03*
+X749Y722D03*
+X749Y522D03*
+X1149Y522D03*
+X1449Y522D03*
+X1149Y422D03*
+X1449Y422D03*
+X1149Y322D03*
+X1449Y322D03*
+X1149Y222D03*
+X1449Y222D03*
+X949Y472D03*
+X949Y72D03*
+G54D11*
+X749Y972D03*
+X599Y972D03*
+X349Y322D03*
+X349Y472D03*
+X349Y672D03*
+X349Y822D03*
+G54D10*
+X699Y122D03*
+X699Y322D03*
+G54D12*
+X699Y222D03*
+X949Y972D03*
+X749Y622D03*
+X1049Y222D03*
+X1249Y872D03*
+G54D13*
+X1149Y872D03*
+X1149Y522D03*
+G54D14*
+X952Y946D02*
+X1045Y249D01*
+G54D15*
+X776Y695D02*
+X721Y695D01*
+X721Y750D01*
+X776Y750D01*
+X776Y695D01*
+D02*
+X671Y150D02*
+X726Y150D01*
+X726Y95D01*
+X671Y95D01*
+X671Y150D01*
+D02*
+G04 End of Copper1*
+M02*