3rd-party/lwip/dhserver: interface for dhcp reply

If more than one interface is used, chances are that the last one added
will have changed the default interface used for sending data (see
netif_set

3rd-party/lwip/dhserver: interface for dhcp reply

If more than one interface is used, chances are that the last one added
will have changed the default interface used for sending data (see
netif_set_default). This causes problems for the DHCP server in the PAN
example as the DHCP reply is sent on the wrong network. On Windows this
can cause it to use the wrong address.

Send replies to the interface that received the dhcp request.

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3rd-party/lwip/dhcp-server: fix unaligned accesses

In the dhcp server, avoid casting a uint8_t* to uint32_t* when using
ip addresses.

lwip/dhcp-server: fix warning

pan_lwip_http_server: list download test files

lwip: support .svg in makefsdata tool

lwip: add download test files to http server demo

pan_lwip_http_server: serve test file for /NumberOfBytes.txt

fix warnings in lwip/dhcpserver and btstack_chipset_em901

new pan_lwip_http_server example

- add lwIP sources commit b3a939417 (after STABLE-2.1.1) as 3rd-party/lwip/core
- add small DHCP server as 3rd-party/lwip/dhcp-server
- add BNEP lwIP adapter that ha

new pan_lwip_http_server example

- add lwIP sources commit b3a939417 (after STABLE-2.1.1) as 3rd-party/lwip/core
- add small DHCP server as 3rd-party/lwip/dhcp-server
- add BNEP lwIP adapter that handles BNEP events and forwards packets between BNEP and lwIP (only tested for NO_SYS == 1)
- add pan_lwip_http_server example that provides lwIP http server on http://192.168.7.1
- example is added to port/libusb

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