[server] actually parse expressions

ivette/src/frama-c/kernel/ASTview.tsx

ivette/src/frama-c/kernel/Locations.tsx

ivette/src/frama-c/plugins/eva/Coverage.tsx

ivette/src/frama-c/plugins/eva/valuetable.tsx

ivette/src/frama-c/states.ts

src/plugins/dive/dive_graph.ml

src/plugins/dive/server_interface.ml

src/plugins/eva/api/general_requests.ml

src/plugins/eva/api/values_request.ml

src/plugins/server/kernel_ast.ml

src/plugins/server/kernel_ast.mli

src/plugins/server/kernel_main.ml

src/plugins/server/kernel_properties.ml

src/plugins/studia/studia_request.ml