wip: move all application files into application folder

quad/sw/modular_quad_pid/.clean_app.tcl

quad/sw/modular_quad_pid/clean.sh

...ular_quad_pid/src/application/Copy of original lscript.ld

quad/sw/modular_quad_pid/src/application/PID.c

quad/sw/modular_quad_pid/src/application/PID.h

quad/sw/modular_quad_pid/src/application/README.txt

...ar_quad_pid/src/application/actuator_command_processing.c

...ar_quad_pid/src/application/actuator_command_processing.h

quad/sw/modular_quad_pid/src/application/callbacks.c

quad/sw/modular_quad_pid/src/application/callbacks.h

quad/sw/modular_quad_pid/src/application/cb_default.h

quad/sw/modular_quad_pid/src/application/commands.c

quad/sw/modular_quad_pid/src/application/commands.h

quad/sw/modular_quad_pid/src/application/communication.c

quad/sw/modular_quad_pid/src/application/communication.h

quad/sw/modular_quad_pid/src/application/computation_graph.c

quad/sw/modular_quad_pid/src/application/computation_graph.h

quad/sw/modular_quad_pid/src/application/control_algorithm.c

quad/sw/modular_quad_pid/src/application/control_algorithm.h

quad/sw/modular_quad_pid/src/application/controllers.c