support simple IC (based on NPN, PNP and resistor)

update node analysis, scf_pack.c, rename ses_step_simplify.c --> ses_step_draw.c, add nand.cpk for NAND, ..

examples/sub.cpk test ok for one-bit sub

1, node analysis for examples/add2.cpk test ok,
2, reduce some unused code

delete some unused files

node analysis for DC

support Inductor for examples/colpitts_oscillator.cpk

support PNP transistor, add pnp_oscillator.cpk

add noise for test & add fft check

node analysis ok

add node analysis

add step 'mesh analysis' for va

1. add mesh analysis, 2. add bridge_algorithm.c, 3. delete some code for capacity 'va', etc..

update the bridge algorithm for capacitor

1, fix: find 'topo path' error when include capacitor in circuit,
2, make the layout show more clearly.

update examples & add arg 'int64_t count' in __ses_step_va()

update examples

support 'capacitor' for oscillator.pack ok

support 'capacitor' & add some electronic graphs for example, such as oscillator.

fix: NPN's dynamic resistance

change resistance value from complex to real number, fix some issues

fix: add.pack error because of ses_step_va_bridge.c

ses_step_va_bridge.c

fix: __ses_path_va_transistor()

fix: and.pack error

use scf/pack instead of protobuf

__ses_flow_a_pos()

__ses_flow_v_neg()

__ses_path_va_bridge()

tmp

tmp

ses_step_va_bridge.c

tmp

tmp

ses_step_va_bridge.c, ses_utils.c

__ses_path_va_bridge()

__ses_path_va_bridge()

__ses_path_va_bridge()

flow->pos_pins, flow->neg_pins

ses_flow_jr()

ses_paths_find_flow()

ses_step_va_bridge.c

__ses_path_va_bridge()

__ses_path_va_transistor()

SCF_EDA_Capacitor

SCF_EDA_Capacitor

fix: __topo_path_bridges()

SCF_EDA_Inductor

ses_step_simplify.c

ses_graph.h

__ses_path_sr()

__ses_path_va_diode()

__ses_path_a_diode()

__topo_path_diodes()

__topo_path_diodes()

_topo_path_completes()

_topo_path_completes()

__ses_status_check()

_simplify_draw()

scf_eda.proto

ses_steps_analyse()

ses_step_topo.c

_topo_path_completes()

_topo_path_completes()

scf_eda_pb.c

fix: __ses_path_pr()

Revert "__ses_de_cross()"

This reverts commit 1fc3497fad908b35f1a2653a83424086e0ce5b99.

__ses_de_cross()

__ses_de_cross()

Revert "tmp"

This reverts commit a4bc411a63b6464c5b5f5d6ad3739f4f804e80b4.

tmp

__dfs_path()

ses_layout_draw()

__ses_de_cross()

__ses_layout_npn()

ses_graph.c

tmp

epin_cmp_npn_c()

npn

tmp

delete some logs

__ses_layout_path2()

__ses_de_cross()

tmp

__ses_de_cross()

Revert "__ses_de_cross()"

This reverts commit 37503abf9de184e19f89b7997147324c16dd6ec0.

__ses_de_cross()

__ses_layout_path2()

__ses_layout_path2()

tmp

tmp

__ses_layout_path2()

Revert "tmp"

This reverts commit 5962f1d3dc67365f61732de80cf04281a1732ff8.

tmp

tmp

__ses_layout_path()

__ses_layout_path()

ses_layout.c

tmp

tmp