Database update

[StrahinjaJacimovic]

Changes needed for necto_db.db.

For Compilers table:

1. Change path field to gcc/riscv/riscv32-unknown-elf-gcc
2. Change c_compiler field to bin/riscv32-unknown-elf-gcc
3. Change cxx_compiler column field to bin/riscv32-unknown-elf-g++
4. Change gdb_path column field to bin/riscv32-unknown-elf-gdb
5. Change asm_compiler column field to bin/riscv32-unknown-elf-as
6. Remove clangd_config column values for all compilers except XC16 and XC32

For CompilerToProgrammer

1. Add primary and foreign key values (like it was done for BoardToDevicetable for example)

IMPORTANT NOTE

Make changes and merge only after the toolchain package has been updated for NECTO!