wip: move all application files into application folder

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

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

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

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

.../modular_quad_pid/src/application/graph_blocks/node_add.c

.../modular_quad_pid/src/application/graph_blocks/node_add.h

...dular_quad_pid/src/application/graph_blocks/node_bounds.c

...dular_quad_pid/src/application/graph_blocks/node_bounds.h

...lar_quad_pid/src/application/graph_blocks/node_constant.c

...lar_quad_pid/src/application/graph_blocks/node_constant.h

...odular_quad_pid/src/application/graph_blocks/node_mixer.c

...odular_quad_pid/src/application/graph_blocks/node_mixer.h

.../modular_quad_pid/src/application/graph_blocks/node_pid.c

.../modular_quad_pid/src/application/graph_blocks/node_pid.h

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

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

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

.../modular_quad_pid/src/application/initialize_components.c

.../modular_quad_pid/src/application/initialize_components.h

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